add file and folder_zip svg icons

apps/backend/app/models/project.py

@@ -15,7 +15,12 @@ from app.models.project_skill import project_skills
 class Project(Base):
     __tablename__ = "projects"
 
-    id = Column(Integer, primary_key=True, index=True)
+    id = Column(
+        Integer,
+        primary_key=True,
+        index=True,
+        nullable=False
+    )
 
     title = Column(
         String(255),
@@ -24,7 +29,8 @@ class Project(Base):
 
     nb_image = Column(
         Integer,
-        default=1
+        default=1,
+        nullable=True
     )
 
     short_description = Column(